var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

// 连接数据库
const mongoose = require('mongoose');
// 设置要连接的 MongoDB 服务器中数据库地址
const dbURL = "mongodb://localhost:27017/woniuxy";
// 开始连接
mongoose.connect(dbURL, { useNewUrlParser: true, useUnifiedTopology: true });
// 设置连接成功的提示信息
mongoose.connection.on('connected', () => console.log(dbURL + ' 数据库连接成功~'));

const jwtAuth = require('./utils/jwtAuth');

// 引入后端路由对象：分配前端请求
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
const studentsRouter = require('./routes/students');
const classesRouter = require('./routes/classes');
const imagesRouter = require('./routes/images');

var app = express();

var allowCrossDomain = function (req, res, next) {
  // 设置允许跨域访问的请求源（* 表示接受任意域名的请求）   
  res.header("Access-Control-Allow-Origin", "*");
  // 设置允许跨域访问的请求头
  res.header("Access-Control-Allow-Headers", "X-Requested-With,Origin,Content-Type,Accept,Authorization");
  // 设置允许跨域访问的请求类型
  res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
  // 同意 cookie 发送到服务器（如果要发送cookie，Access-Control-Allow-Origin 不能设置为星号）
  res.header('Access-Control-Allow-Credentials', 'true');
  next();
};
app.use(allowCrossDomain);

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// 让 jwt 的配置生效（注意：配置在路由的一级路径之前）
app.use(jwtAuth);

// 匹配前端ajax请求的一级路径
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/students', studentsRouter);
app.use('/classes', classesRouter);
app.use('/images', imagesRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});


// module.exports = app;
app.listen(3000, () => console.log('3000 端口服务器启动成功'));
